Question

stiind ca:
a)b+c=21 si a=7,calculati axb+axc
b)b-c=31 si axc-axc=837,calculati a
c)axb-axc=1440si a=45,calculati b-c
d)a+b-c=48 si d=144:(95-83),calculati axb+b+d-cxd
e)b-c=7,a=14,b=21,calculati ax(b-c)+axb
pute-ti sa ma ajuati va rog..

Answer 1

a)b+c=21 si a=7,calculati axb+axc7

axb+axc=ax(b+c)=7x21=147

 b)b-c=31 si axb-axc=837,calculati a

axb-axc=837
ax(b-c)=837
ax31=837
a=837:31
a=27

c)axb-axc=1440si a=45,calculati b-c

axb-axc=1440
ax(b-c)=1440
45x(b-c)=1440
b-c=1440:44
b-c=32.(72)

d)a+b-c=48 si d=144:(95-83),calculati axb+b+d-cxd
d=144:(95-83)=144/12=12
axb+b+d-cxd=axb+b+12-cx12=bx(a+1)+12x(1-c)
ceva e gresit in enunt



e)b-c=7,a=14,b=21,calculati ax(b-c)+axb
ax(b-c)+axb =14x7+14x21=14x28=392